We know at least that Luna's powers operate via touch, and that her family has a history with the supernatural (specifically with regards to spirits and/or the soul). We also know that Luna can see things that will happen to that person later on, so it doesn't necessarily mean she could see a person's end (though it could be part of the list of things she sees).
My personal theory is that her powers are likely soul-related, in that she could see the fates of souls, but not Orion's because either there is something horribly wrong with his, or my crackpot theory is legit and that the soul residing within Orion is not his in the first place and that his vessel/mortal body is technically "empty" (basically meaning she can't read someone fate if their body and soul don't technically match). And the reason why her powers don't work in Eternum is because she and other players are essentially Astral Projections, and thus are just "copies" of the soul instead of the real deal.
Of course, there's the matter of "excommunication" and how that works if the one the Praetorians are excommunicating is just a "copy" of the soul. Could be that "excommunication" sends a killswitch to the nerve implant, which in turn bounces a player's true soul back into Eternum for collaring/transformation into an NPC. Anyway, this is me just spitballing theories, could be that Luna's powers operate differently and that excommunication has a different process from what I've said. We'll have to wait until a later update to see that thing settled (maybe in the next one given that it should be Luna's turn in the LI roulette).
